JP6887739B2 - Surface aesthetic improver composition for hydraulic composition - Google Patents

Description

The present invention relates to a surface aesthetic improving agent composition for a hydraulic composition, a hydraulic composition, a method for producing a cured product of a hydraulic composition, and a method for improving the surface aesthetics of a hydraulic composition.

Various admixtures are used for the purpose of improving the physical properties of hydraulic compositions such as concrete. In particular, AE agents, water reducing agents, and AE water reducing agents are often used from the viewpoints of improving the fluidity and dispersibility of uncured concrete. These are useful in that they have high water reduction and can reduce slump loss, but on the other hand, there is a problem that the amount of air entrained in the concrete tends to increase. When the amount of air entrained in the concrete increases, coarse bubbles are likely to occur, resulting in uneven filling and a decrease in the strength of the cured product, and further forming voids (air bubble traces) on the surface of the cured product, which is a factor that spoils the appearance. .. In order to reduce the bubble marks, if the buoyancy of the bubbles is larger than the fluid resistance and adhesive force of the water-hard composition, the bubbles can be separated from the mold. Therefore, the smaller the yield value of the fluid resistance of the water-hard composition, the more. That is, the greater the fluidity of the water-hard composition, the more defoaming is promoted.

Patent Document 1 discloses a surface aesthetic improver capable of reducing air bubble marks from the surface of a cement molded product by containing a specific alkanolamide. Further, in Patent Document 2, by adding a cement additive containing two specific types of alcohols, which is obtained by adding an alkylene oxide to alcohol in a block shape, to the cement, the surface is excellent in surface aesthetics without bubbles. It is disclosed that mortar and concrete can be obtained.

Japanese Unexamined Patent Publication No. 2007-7708 Japanese Unexamined Patent Publication No. 1-131041

However, the surface aesthetic improver of the hydraulic composition described in Patent Documents 1 and 2 does not necessarily satisfy the surface aesthetic depending on the hydraulic composition used. In addition, if the surface aesthetic improver can be mixed with the cement dispersant added together with the hydraulic composition and liquefied, it is easy to accept because it is not necessary for concrete factories to construct new tank equipment. It becomes a feature.

INDUSTRIAL APPLICABILITY The present invention relates to an aesthetic improver composition for a hydraulic composition, which can obtain a cured product of a hydraulic composition having excellent compounding stability and excellent surface aesthetics, and a hydraulic composition having excellent surface aesthetics and its curing. Provided are a method for producing a body and a method for improving the surface aesthetics of a hydraulic composition.

In the present invention, (A) fatty acid alkanolamide (hereinafter referred to as (A) component) and (B) polycarboxylic acid-based dispersant (hereinafter referred to as (B) component) having a fatty acid portion having 10 or more and 24 or less carbon atoms. ), And (C) a surface for a water-hard composition containing one or more solvents (hereinafter referred to as component (C)) selected from the compounds represented by the following general formulas (c1) and the following general formula (c2). Regarding aesthetic improver composition.
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ]

The present invention also relates to a hydraulic composition containing (A) component, (B) component, (C) component and hydraulic powder, and water.

Further, the present invention is a step of preparing a water-hard composition by mixing a component (A), a component (B), a component (C), a water-hard powder, and water to prepare the water-hardness. The present invention relates to a method for producing a cured product, which comprises a step of filling a mold with the composition and curing the composition, and a step of removing the cured hydraulic composition.

Further, the present invention is a method for improving the surface aesthetics of a hydraulic composition, which comprises adding a component (A), a component (B) and a component (C) to a hydraulic composition containing a hydraulic powder and water. Regarding.

According to the present invention, an aesthetic improver composition for a hydraulic composition capable of obtaining a cured product of a hydraulic composition having excellent compounding stability and excellent surface aesthetics, a hydraulic composition having excellent surface aesthetics, and the like. A method for producing the cured product and a method for improving the surface aesthetic appearance of the hydraulic composition are provided.

Photograph of the upper surface of each concrete after tapping work of Example 2-10 (right) and Comparative Example 2-11 (left)

[Surface aesthetic improver composition for hydraulic composition]
In general, the greater the fluidity of the hydraulic composition, the easier it is for the air in the concrete to defoam, so that the surface bubble marks on the concrete product decrease. The specific alkanolamide which is the component (A) of the present invention has a property of improving the wettability of the water-hard composition to the mold, and the polycarboxylic acid-based dispersant which is the component (B) is , It is a component that improves the fluidity of the water-hard composition, reduces the surface bubble marks of the water-hard composition, and improves the surface appearance. However, since the component (A) has a low HLB and has oil properties, ( B) Even if it is mixed with the dispersant which is a component, it separates into two layers. The present invention has found that a composition containing the components (A) and (B) can be liquefied by using the component (A) and the component (B) in combination with the component (C) which is a specific solvent. Furthermore, it has been found that the use of the composition improves the surface aesthetics of the water-hard composition.
Further, in the present invention, by blending the optional component (D) with the composition, the component (D) forms a string-like micelle with the component (A), and the material of the water-hard composition is generally separated. It is an invention that has been found to have an even more excellent surface aesthetic improvement effect because it is excellent in material separation resistance even in the case of fluidity.

<Ingredient (A)>
The surface aesthetic improver composition for a hydraulic composition of the present invention contains, as the component (A), a fatty acid alkanolamide having a fatty acid portion having 10 or more and 24 or less carbon atoms.

The hydrocarbon group of the fatty acid moiety is a hydrocarbon group containing a carbon atom of a carboxyl group in the raw material fatty acid of the fatty acid alkanolamide, preferably a linear or branched alkyl group or a linear or branched alkenyl group. It is more preferably a linear or branched alkenyl group, and even more preferably a linear alkenyl group.

The carbon number of the fatty acid portion is the number of carbon atoms including the carbon atom of the carboxyl group in the raw material fatty acid of the fatty acid alkanolamide, and is 10 or more, preferably 12 or more, and 24 or less from the viewpoint of the effect of reducing bubble marks on the surface of the concrete product. It is preferably 22 or less, more preferably 20 or less, still more preferably 18 or less, and even more preferably 16 or less.

Examples of the fatty acid alkanolamide include fatty acid monoethanolamide, fatty acid methylmonoethanolamide, fatty acid ethylmonoethanolamide, fatty acid propylmonoethanolamide, fatty acid methanolethanolamide, fatty acid diethanolamide, and the like, and have an effect of reducing air bubble marks on the surface of concrete products. From the viewpoint of the above, fatty acid diethanolamide is preferable.

The component (A) is, for example, oleic acid diethanolamide, stearic acid diethanolamide, a compound having 10 or more and 18 or less carbon atoms in the fatty acid portion of palm nucleus fatty acid diethanolamide, coconut fatty acid diethanolamide, myristic acid diethanolamide, and lauric acid. Examples thereof include acid diethanolamide, and one or more of these may be used in combination. The component (A) is preferably one or more selected from oleic acid diethanolamide, palm nucleus fatty acid diethanolamide, and coconut fatty acid diethanolamide from the viewpoint of the effect of reducing air bubble marks on the surface of the concrete product, and more preferably oleic acid. It is one or more selected from diethanolamide and palm nuclear fatty acid diethanolamide, and more preferably palm nuclear fatty acid diethanolamide.

The component (A) is obtained by reacting a higher fatty acid with an alkanolamine, and by-products other than the fatty acid alkanolamide are simultaneously produced. Examples of by-products include fatty acid alkanolamide fatty acid monoesters in which fatty acids are dehydrated and condensed, fatty acid alkanolamide fatty acid diesters, fatty acid alkanolamine monoesters in which alkanolamines and fatty acids are dehydrated and condensed, and fatty acid alkanolamine diesters. The component (A) of the present invention may contain a small amount of the above-mentioned by-product as long as the effect of the present invention is not impaired. The content of the by-product in the component (A) is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and further preferably 5 parts by mass or less in 100 parts by mass of the component (A).

<Ingredient (B)>
The surface aesthetic improver composition for a hydraulic composition of the present invention contains a polycarboxylic acid-based dispersant as a component (B) from the viewpoint of improving the fluidity of the hydraulic composition and improving the surface aesthetics. ..

As the polycarboxylic acid-based dispersant, a copolymer containing the monomer (b1) represented by the following general formula (b1) as a constituent monomer is preferable from the viewpoint of the effect of reducing air bubble marks on the surface of the concrete product.
The polycarboxylic acid-based dispersant contains a monomer (b1) represented by the following general formula (b1) and a monomer (b2) represented by the following general formula (b2) as constituent monomers. Coalescence is more preferred.

[In the formula,
R ^1b , R ^2b : may be the same or different, hydrogen atom or methyl group R ^3b : hydrogen atom or -COO (AO) _n1 X ^1b
X ^1b : Hydrogen atom or alkyl group having 1 or more and 4 or less carbon atoms AO: Group selected from ethyleneoxy group and propyleneoxy group n1: Average number of moles of AO, 1 or more and 300 or less q: 0 or more and 2 The following numbers p: Indicates a number of 0 or 1. ]

[In the formula,
R ^4b , R ^5b , R ^6b : may be the same or different and may be a hydrogen atom, a methyl group or (CH ₂ ) _r COM ^2b , where (CH ₂ ) _r COM ^2b is COM ^1b or another (CH _2). ) _R COMM ^2b may form an anhydride, in which case M ^1b , M ^2b of those groups are absent.
M ^1b , M ^2b : may be the same or different, hydrogen atom, alkali metal, alkaline earth metal (1/2 atom), ammonium group, alkylammonium group, substituted alkylammonium group, alkyl group, hydroxyalkyl group or Alkyl group r: Indicates a number of 0 or more and 2 or less. ]

In the general formula (b1), R ^1b is preferably a hydrogen atom from the viewpoint of flow retention.
In the general formula (b1), R ^2b is preferably a methyl group from the viewpoint of flow retention.
In the general formula (b1), R ^3b is preferably a hydrogen atom from the viewpoint of flow retention.
In the general formula (b1), X ^1b is preferably a hydrogen atom or a methyl group, and more preferably a methyl group, from the viewpoint of flow retention.
In the general formula (b1), ethyleneoxy group is preferable for AO from the viewpoint of flow retention. The AO preferably contains an ethyleneoxy group.
In the general formula (b1), n1 is the average number of moles of AO added, and is 1 or more, preferably 5 or more, more preferably 10 or more, still more preferably 15 or more, still more preferably, from the viewpoint of flow retention. It is 20 or more, and 300 or less, preferably 200 or less, more preferably 150 or less, still more preferably 130 or less.
In the general formula (b1), p is preferably 1 from the viewpoint of flow retention.

In the general formula (b2), from the viewpoint of flow retention, R ^4b is preferably a hydrogen atom.
In the general formula (b2), R ^5b is preferably a methyl group from the viewpoint of flow retention.
In the general formula (b2), from the viewpoint of flow retention, R ^6b is preferably a hydrogen atom.
For (CH ₂ ) _r COMM ^2b , anhydrous may be formed with COOM ^1b or other (CH ₂ ) _r COMM ^{2b , in which case M 1b} and M ^2b of those groups are absent.
M ^1b and M ^2b may be the same or different, hydrogen atom, alkali metal, alkaline earth metal (1/2 atom), ammonium group, alkylammonium group, substituted alkylammonium group, alkyl group, hydroxyalkyl group or It is an alkenyl group.
The alkyl group, hydroxyalkyl group, and alkenyl group of M ^1b and M ^2b each preferably have 1 or more and 4 or less carbon atoms.
M ^1b and M ^2b may be the same or different, preferably a hydrogen atom, an alkali metal, an alkaline earth metal (1/2 atom), an ammonium group, or an alkylammonium group, and a hydrogen atom, an alkali metal, or an alkaline soil. Alkali metals (1/2 atoms) or ammonium groups are more preferred, hydrogen atoms, alkali metals or alkaline earth metals (1/2 atoms) are even more preferred, and hydrogen atoms or alkali metals are even more preferred.
From the viewpoint of flow retention, the _{r of (CH 2} ) r COMM ^{2b in} the general formula (b2) is preferably 1.

From the viewpoint of flow retention, the total amount of the monomers (b1) in the constituent monomers of the copolymer containing the monomer (b1) as the constituent monomers is preferably 70% by mass or more. It is preferably 75% by mass or more, more preferably 80% by mass or more, and preferably 100% by mass or less.
The copolymer containing the monomer (b1) and the monomer (b2) as a constituent monomer is the monomer (b1) and the monomer (b1) in the constituent monomer from the viewpoint of flow retention. The total amount of b2) is preferably 80% by mass or more, more preferably 85% by mass or more, further preferably 90% by mass or more, and preferably 100% by mass or less. This total amount may be 100% by mass.

The copolymer containing the monomer (b1) and the monomer (b2) as a constituent monomer is the monomer (b2) in the total of the monomer (b1) and the monomer (b2). From the viewpoint of the flow retention of the water-hard composition, the ratio is preferably 40 mol% or more, preferably 99 mol% or less, more preferably 97 mol% or less, still more preferably 95 mol% or less.

A polycarboxylic acid-based dispersant, a copolymer containing a monomer (b1) as a constituent monomer, and a copolymer containing a monomer (b1) and a monomer (b2) as a constituent monomer. The weight average molecular weight of the water-hard composition is preferably 20,000 or more, more preferably 30,000 or more, still more preferably 40,000 or more, and preferably 100,000 or less, from the viewpoint of fluid retention of the water-hard composition. It is more preferably less than 100,000, still more preferably 80,000 or less.

A polycarboxylic acid-based dispersant, a copolymer containing a monomer (b1) as a constituent monomer, and a copolymer containing a monomer (b1) and a monomer (b2) as a constituent monomer. The weight average molecular weight and the number average molecular weight of the above are measured by the gel permeation chromatography (GPC) method under the following conditions, respectively.
* GPC conditions Equipment: GPC (HLC-8320GPC) manufactured by Tosoh Corporation Column: G4000PWXL + G2500PWXL (manufactured by Tosoh Corporation)
Eluent: 0.2M phosphate buffer / CH ₃ CN = 9/1
Flow rate: 1.0 mL / min
Column temperature: 40 ° C
Detection: RI
Sample size: 0.2 mg / mL
Standard substance: Polyethylene glycol equivalent (monodisperse polyethylene glycol with known molecular weight, molecular weight 87,500, 250,000, 145,000, 46,000, 24,000)

As the polycarboxylic acid-based dispersant, two or more kinds of dispersants having different average number of moles of AO added, ratio of monomer (b1) and monomer (b2), etc. can be used.

<Ingredient (C)>
The surface aesthetic improver composition for a hydraulic composition of the present invention has the following general formula (c1) and the following general formula (c1) from the viewpoint of liquefying the component (A) and the component (B) as the component (C). It contains one or more solvents selected from the compounds represented by c2).
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ]

In the general formula (c1), when R ^1c is a hydrocarbon group containing no aromatic ring, R ^1c provides a viewpoint of liquefying the component (A) and the component (B) and the surface aesthetics of the water-hard composition. From the viewpoint of improvement, an alkyl group or an alkenyl group having 4 or more carbon atoms and 15 or less, preferably 10 or less, more preferably 8 or less, still more preferably 6 or less is preferable. When R ^{1c is a hydrocarbon group containing an aromatic ring, the number of carbon atoms of R 1c} is 6 or more, and from the viewpoint of liquefying the component (A) and the component (B) and improving the surface aesthetics, and , 15 or less, preferably 12 or less, more preferably 7 or less, and may be 6.

In the general formula (c1), n is 1 or more, and 5 or less, preferably 4 from the viewpoint of liquefying the component (A) and the component (B) and improving the surface aesthetics of the hydraulic composition. Below, it is more preferably 3 or less, still more preferably 2 or less, and preferably an integer. Further, n may be the average number of moles added of EO.

In the general formula (c1), m is 0 or more, and 5 or less, preferably 4 from the viewpoint of liquefying the component (A) and the component (B) and improving the surface aesthetics of the hydraulic composition. Hereinafter, the number is more preferably 3 or less, further preferably 2 or less, still more preferably 1 or less, preferably an integer, and may be 0. Further, m may be the average number of added moles of PO.

In the general formula (c2), R ^2c has 6 or more carbon atoms and 12 or less carbon atoms from the viewpoint of liquefying the component (A) and the component (B) and improving the surface aesthetics of the water-hard composition. It is preferably a hydrocarbon group of 10 or less, more preferably 8 or less, preferably an alkyl group or an alkenyl group, and more preferably an alkyl group.

In the general formula (c2), R ^3c and R ^4c have 1 carbon atoms independently from the viewpoint of liquefying the component (A) and the component (B) and improving the surface aesthetics of the water-hard composition. These are hydrocarbon groups of 4 or less, preferably 3 or less, more preferably 2 or less, preferably alkyl or alkenyl groups. It is more preferable that both R ^3c and R ^{4c are methyl groups.}

The component (C) is specifically selected from phenoxyethanol, phenyldiglycol, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and alkyldimethylamine having an alkyl group having 8 or more and 10 or less carbon atoms. From the viewpoint of liquefying the component (A) and the component (B), phenoxyethanol, phenyldiglycol, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and octyl. One or more solvents selected from dimethylamine and decyldimethylamine are preferable, and one or more solvents selected from phenoxyethanol, phenyldiglycol, diethylene glycol monobutyl ether, octyldimethylamine, and decyldimethylamine are more preferable, and phenoxyethanol is preferable. More preferred.

<Composition, etc.>
The surface aesthetic improver composition for a water-hard composition of the present invention contains the component (A) in an amount of preferably 0.1% by mass or more, more preferably 0, from the viewpoint of reducing air bubble marks on the surface of the cured body of the water-hard composition. 5.5% by mass or more, more preferably 1.0% by mass or more, and from the viewpoint of cost and fluidity of the water-hard composition, preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably. It is contained in an amount of 15% by mass or less, more preferably 10% by mass or less.

The surface aesthetic improver composition for a water-hard composition of the present invention contains the component (B) in an amount of preferably 3% by mass or more, more preferably 5% by mass or more, and further, from the viewpoint of reducing surface bubble marks by improving dispersibility. It is preferably 7% by mass or more, more preferably 10% by mass or more, still more preferably 15% by mass or more, still more preferably 20% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less. , More preferably 35% by mass or less, still more preferably 30% by mass or less.

In the surface aesthetic improving agent composition for a water-hard composition of the present invention, the mass ratio (B) / (A) of the content of the component (A) to the content of the component (B) is the surface aesthetic improving effect and the flow. From the viewpoint of sex, it is preferably 2 or more, more preferably 4 or more, still more preferably 10 or more, still more preferably 20 or more, still more preferably 30 or more, and preferably 200 or less, more preferably 150 or less, further. It is preferably 100 or less, more preferably 80 or less, and even more preferably 70 or less.

In the surface aesthetic improver composition for a water-hardening composition of the present invention, the component (C) is preferably 2.5% by mass or more, more preferably 2.5% by mass or more, from the viewpoint of liquefying the component (A) and the component (B). Is 5.0% by mass or more, and from the viewpoint of cost, it is preferably contained in an amount of 25% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, still more preferably 10% by mass or less.

In the surface aesthetic improver composition for a water-hardening composition of the present invention, the mass ratio (C) / (B) of the content of the component (B) to the content of the component (C) is the component (B) and (B). A) From the viewpoint of liquefying the components, preferably 0.01 or more, more preferably 0.03 or more, further preferably 0.05 or more, and from the viewpoint of cost, preferably 0.2 or less, more preferably. It is 0.15 or less, more preferably 0.1 or less.

From the viewpoint of the surface aesthetic improving effect, the surface aesthetic improving agent composition for a water-hard composition of the present invention has a hydrocarbon group having 12 or more and 22 or less carbon atoms as the component (D), and has an average addition molar of alkylene oxide. It preferably contains a sulfate ester or a salt thereof, the number of which is 0 or more and 25 or less.

The hydrocarbon group of the component (D) is preferably a linear or branched alkyl group or a linear or branched alkenyl group, more preferably a linear or branched alkenyl group, and even more preferably a direct chain. The alkenyl group of the chain.
From the viewpoint of the effect of improving the surface aesthetics, the number of carbon atoms of the hydrocarbon group is 12 or more, preferably 14 or more, more preferably 16 or more, further preferably 18 or more, and 22 or less, preferably 20 or less.

Examples of the hydrocarbon group of the component (D) include one or more selected from a lauryl group, a myristyl group, a palmityl group, an oleyl group, a stearyl group and a docosyl group, preferably a myristyl group, a palmityl group, an oleyl group and the like. It is one or more selected from a stearyl group, more preferably one or more selected from a palmityl group, an oleyl group and a stearyl group, still more preferably an oleyl group, a stearyl group, and even more preferably a stearyl group.

Examples of the alkylene oxide of the component (D) include alkylene oxides having 2 or more and 4 or less carbon atoms. Ethylene oxide is preferable as the alkylene oxide. The component (D) preferably contains ethylene oxide as an alkylene oxide.

As the salt of the sulfate ester of the component (D), from inorganic salts selected from sodium salt, ammonium salt, potassium salt, calcium salt, magnesium salt and the like, monoethanolammonium salt, diethanolammonium salt, triethanolammonium salt, morpholinium salt and the like. The organic ammonium salt of choice is suitable.

Specific examples of the component (D) include alkyl sulphate, alkenyl sulphate, polyoxyalkylene alkyl ether sulphate, polyoxyalkylene alkenyl ether sulphate, alkyl phenyl sulphate, alkenyl phenyl sulphate, polyoxyalkylene alkyl phenyl ether sulphate, and polyoxy. Examples thereof include alkylene alkenyl phenyl ether sulfate, and one or more selected from alkenyl sulfate, polyoxyalkylene alkyl ether sulfate, and polyoxyalkylene alkenyl ether sulfate are preferable from the viewpoint of imparting material separation resistance, and polyoxyalkylene alkyl ether is preferable. More preferably, one or more selected from sulfate and polyoxyalkylene alkenyl ether sulfate.

The surface aesthetic improver composition for a water-hard composition of the present invention contains the component (D) in an amount of preferably 0.1% by mass or more, more preferably 0.5% by mass or more, from the viewpoint of the effect of improving the surface aesthetics. Then, preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, still more preferably 10% by mass or less, still more preferably 5% by mass or less, still more preferably 3% by mass. It contains the following.

The surface aesthetic improver composition for a hydraulic composition of the present invention preferably contains water.
The surface aesthetic improver composition for a water-hard composition of the present invention contains water, preferably 50% by mass or more, more preferably 55% by mass, from the viewpoint of ensuring fluidity with an appropriate addition amount and from the viewpoint of storage stability. % Or more, more preferably 60% by mass or more, still more preferably 65% by mass or more, still more preferably 67% by mass or more, still more preferably 70% by mass or more, and preferably 97% by mass or less, more preferably. It is contained in an amount of 90% by mass or less, more preferably 85% by mass or less, and even more preferably 80% by mass or less.

The surface aesthetic improver composition for hydraulic compositions of the present invention comprises conventional cement dispersants, water-soluble polymer compounds, air entrainers, cement wetting agents, swelling agents, retarders, quick-setting agents, thickeners, etc. It can contain components (excluding components (A) to (D)) such as a flocculant, a strength enhancer, a hardening accelerator, and a preservative.

By adding the surface aesthetic improver composition for a hydraulic composition of the present invention to the hydraulic composition, a cured product of the hydraulic composition having excellent surface aesthetics can be obtained.
Further, the surface aesthetic improver composition for a hydraulic composition of the present invention is a hydraulic composition having an excellent surface aesthetic even when the hydraulic composition contains a non-hydraulic powder described later. A cured product can be obtained. That is, the surface aesthetic improver composition for a hydraulic composition of the present invention is suitable for a hydraulic composition containing a non-hydraulic powder.

When fly ash is contained in the hydraulic composition as a non-hydraulic powder described later, the unburned carbon contained in the fly ash causes darkening on the surface of the cured product of the hydraulic composition, and the surface of the cured product is darkened. The aesthetics tend to be spoiled. However, the surface aesthetic improver composition for a hydraulic composition of the present invention is a non-hydraulic powder, even in a hydraulic composition containing fly ash, by dispersing unburned carbon contained in fly ash. , The surface of the cured product of the hydraulic composition can be whitened without causing darkening on the surface of the cured product. That is, the surface aesthetic improver composition for a hydraulic composition of the present invention is suitable as a non-hydraulic powder for a hydraulic composition containing fly ash.

[Hydraulic composition]
The hydraulic composition of the present invention contains a component (A), a component (B), a component (C), a hydraulic powder, and water. Further, the hydraulic composition of the present invention may contain a surface aesthetic improver composition for a hydraulic composition of the present invention, a hydraulic powder, and water.
Further, the hydraulic composition of the present invention may contain a component (A), a component (B), a component (C), an optional component (D), a hydraulic powder, and water.
As the hydraulic composition of the present invention, the matters described in the surface aesthetic improver composition for a hydraulic composition of the present invention can be appropriately applied.
The components (A), (B), (C), and optional component (D) used in the hydraulic composition of the present invention are each a surface aesthetic improver composition for the hydraulic composition of the present invention. It is the same as the one described in the thing.

The hydraulic powder used in the hydraulic composition of the present invention is a powder that is cured by being mixed with water alone. Examples of hydraulic powder include ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, sulfate-resistant Portland cement, low-heat Portland cement, white Portland cement, and eco-cement (for example, JIS R5214). Among these, cement selected from early-strength Portland cement, ordinary Portland cement, sulfuric acid-resistant Portland cement and white Portland cement is preferable and early-strength from the viewpoint of shortening the time required to reach the required strength of the hydraulic composition. Cement selected from Portland cement and ordinary Portland cement is more preferable.

The hydraulic composition of the present invention may contain a non-hydraulic powder. In the present invention, the non-hydraulic powder means a powder that does not cure or hardly cures even when mixed with water by itself. However, the non-hydraulic powder includes a latent hydraulic powder having a property of being cured by being mixed with water under predetermined conditions such as an alkaline or acidic atmosphere or a high-pressure steam atmosphere. For example, slag does not have curability by itself, but when combined with alkaline substances such as lime and cement and water, it has the property of forming hydrates and hardening by interaction through water (latent hydraulic hardness). , Potential hydraulic powder. The non-hydraulic powder is preferably a non-hydraulic inorganic powder. Examples of the non-aqueous hard powder include one or more selected from calcium hydroxide, gypsum, calcium carbonate, silica stone, clay, blast furnace slag, fly ash, and silica fume, and are selected from calcium carbonate and fly ash. One or more of them are preferable. Further, as the non-hydraulic powder, a latent hydraulic powder is preferable.

The water-hard composition of the present invention is abbreviated as water / water-hard powder ratio [mass percentage (mass%) of water and water-hard powder in slurry, W / C. ], But preferably 20% by mass or more, more preferably 30% by mass or more, further preferably 40% by mass or more, and preferably 70% by mass or less, more preferably 60% by mass or less, still more preferably 57% by mass or less. Is.

The water-hard composition of the present invention is abbreviated as water / powder ratio [mass percentage (mass%) of water and powder (total amount of water-hard powder and non-water-hard powder) in slurry, W / P. Will be done. ], Is preferably 15% by mass or more, more preferably 20% by mass or more, further preferably 25% by mass or more, still more preferably 30% by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less. , More preferably 45% by mass or less, still more preferably 40% by mass or less.

In order to improve the surface aesthetics of the cured product of the hydraulic composition, a highly fluid hydraulic composition is desired, but when a hydraulic powder such as ordinary Portland cement is used alone as the powder, The viscosity becomes too high and the fluidity becomes low, and hydraulic powder such as ordinary Portland cement is expensive and uneconomical. Therefore, in addition to the hydraulic powder, the hydraulic composition contains a non-hydraulic powder such as calcium carbonate or fly ash, which is inexpensive, to ensure fluidity and reduce the amount of powder. By doing so, the material cost can be reduced, but if the amount of powder in the hydraulic composition is reduced too much, the fluidity deteriorates, the material is likely to separate, and the strength of the cured product is reduced and the surface appearance is deteriorated. It becomes a problem because it makes it worse.
However, in the hydraulic composition of the present invention, in order to reduce the material cost, even when a non-hydraulic powder such as calcium carbonate or fly ash is contained as the powder in addition to the hydraulic powder, the fluidity is fluid. It is possible to improve the surface aesthetics of the cured product while maintaining good material separation resistance and the strength of the cured product.

When the hydraulic composition of the present invention contains a non-hydraulic powder, the mass ratio of the content of the hydraulic powder to the content of the non-hydraulic powder (hydraulic powder / non-hydraulic powder) The body) is preferably 0.25 or more, more preferably 0.5 or more, still more preferably 1 from the viewpoint of achieving both slimming of the hydraulic composition, cost reduction, and ensuring the strength of the cured product of the hydraulic composition. It is 0.0 or more, preferably 10 or less, more preferably 5 or less, still more preferably 3 or less.

When the hydraulic composition of the present invention contains a non-hydraulic powder, the content of the hydraulic powder and the content of the powder (total content of the hydraulic powder and the non-hydraulic powder) The mass ratio (hydraulic powder / powder) of is preferably 0.3 or more, more preferably, from the viewpoint of achieving both slimming of the hydraulic composition, cost reduction, and ensuring the strength of the cured product of the hydraulic composition. Is 0.4 or more, more preferably 0.5 or more, and preferably 1 or less, more preferably 0.9 or less, still more preferably 0.8 or less.

When the hydraulic composition of the present invention contains calcium carbonate as a non-hydraulic powder, the mass ratio (hydraulic powder / calcium carbonate) between the content of the hydraulic powder and the content of calcium carbonate is From the viewpoint of reducing the viscosity of the hydraulic composition, reducing the cost, and ensuring the strength of the cured product of the hydraulic composition, it is preferably 0.25 or more, more preferably 0.5 or more, still more preferably 1.0 or more. , And preferably 10 or less, more preferably 5 or less, still more preferably 3 or less.

When fly ash is contained as a non-hydraulic powder in the hydraulic composition, the unburned carbon contained in the fly ash causes darkening on the surface of the cured product of the hydraulic composition, and the surface appearance of the cured product is improved. Tends to be compromised. However, in the hydraulic composition of the present invention, even when fly ash is contained as a non-hydraulic powder, unburned carbon contained in the fly ash is dispersed on the surface of the cured product of the hydraulic composition. The surface of the cured product can be whitened without causing darkening.

When the hydraulic composition of the present invention contains fly ash as a non-hydraulic powder, the mass ratio of the content of the hydraulic powder to the content of fly ash (hydraulic powder / fly ash) is From the viewpoint of reducing the viscosity of the hydraulic composition, reducing the cost, and ensuring the strength of the cured product of the hydraulic composition, it is preferably 0.25 or more, more preferably 0.5 or more, still more preferably 1.0 or more. And, preferably 10 or less, more preferably 5 or less, still more preferably 4 or less, still more preferably 3 or less.

In the hydraulic composition of the present invention, the component (A) is preferably added to 100 parts by mass or more of 0.001 part by mass or more from the viewpoint of improving the surface aesthetic appearance of the cured product of the hydraulic composition with respect to 100 parts by mass of the hydraulic powder. More preferably 0.005 parts by mass or more, further preferably 0.025 parts by mass or more, and preferably 0.1 parts by mass or less, more preferably 0.07 parts by mass or less, still more preferably 0.05 parts by mass or less. contains.
In the water-hard composition of the present invention, the component (A) is added to the surface of the cured body of the water-hard composition with respect to 100 parts by mass of the powder (100 parts by mass of the total amount of the water-hard powder and the non-water-hard powder). From the viewpoint of aesthetic improvement effect, it is preferably 0.003 parts by mass or more, more preferably 0.005 parts by mass or more, further preferably 0.01 parts by mass or more, and preferably 0.1 parts by mass or less, more preferably 0.1 parts by mass or less. It is contained in an amount of 0.07 parts by mass or less, more preferably 0.05 parts by mass or less.

The water-hard composition of the present invention preferably contains the component (B) in an amount of 0.05 parts by mass or more, more preferably, with respect to 100 parts by mass of the water-hard powder, from the viewpoint of ensuring the fluidity of the water-hard composition. Is 0.07 parts by mass or more, more preferably 0.09 parts by mass or more, and from the viewpoint of material separation resistance of the water-hard composition, preferably 1.0 parts by mass or less, more preferably 0.9 parts by mass. Hereinafter, the content is more preferably 0.8 parts by mass or less, still more preferably 0.5 parts by mass or less.
The water-hard composition of the present invention contains the component (B) and the fluidity of the water-hard composition with respect to 100 parts by mass of the powder (total amount of the water-hard powder and the non-water-hard powder is 100 parts by mass). From the viewpoint of securing, preferably 0.05 parts by mass or more, more preferably 0.07 parts by mass or more, still more preferably 0.09 parts by mass or more, still more preferably 0.3 parts by mass or more, still more preferably 0. .4 parts by mass or more, and from the viewpoint of material separation resistance of the water-hard composition, preferably 3.0 parts by mass or less, more preferably 2.5 parts by mass or less, still more preferably 2.0 parts by mass or less. It is further preferably 1.0 part by mass or less, still more preferably 0.9 part by mass or less, still more preferably 0.8 part by mass or less, still more preferably 0.5 part by mass or less.

In the hydraulic composition of the present invention, the mass ratio (B) / (A) of the content of the component (A) to the content of the component (B) is preferably from the viewpoint of surface aesthetic improvement effect and fluidity. 2 or more, more preferably 4 or more, still more preferably 10 or more, still more preferably 20 or more, still more preferably 30 or more, and preferably 200 or less, more preferably 150 or less, still more preferably 100 or less, even more. It is preferably 80 or less, and even more preferably 70 or less.

The water-hard composition of the present invention has (C) with respect to 100 parts by mass of the water-hard powder from the viewpoint of containing a liquefied component (A) and (B) in the water-hard composition. The component is preferably contained in an amount of 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and preferably 0.1 parts by mass or less, more preferably 0.08 parts by mass or less.
The water-hard composition of the present invention has 100 parts by mass of powder (water-hard powder and non-water-hard) from the viewpoint of containing a liquefied component (A) and (B) in the water-hard composition. The component (C) is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and preferably 0.1 parts by mass or less, based on 100 parts by mass of the total amount of the powder. It is preferably contained in an amount of 0.08 part by mass or less.

In the water-hardening composition of the present invention, the mass ratio (C) / (B) of the content of the component (B) to the content of the component (C) is a liquefaction of the component (B) and the component (A). From the viewpoint of making the mixture, it is preferably 0.01 or more, more preferably 0.03 or more, further preferably 0.05 or more, and from the viewpoint of cost, preferably 0.2 or less, more preferably 0.15 or less, still more preferable. Is 0.1 or less.

When the water-hard composition of the present invention contains the component (D), the component (D) is preferably 0.0005 with respect to 100 parts by mass of the water-hard powder from the viewpoint of liquefaction with the dispersant. It is contained in an amount of 7 parts by mass or more, more preferably 0.002 parts by mass or more, further preferably 0.003 parts by mass or more, and preferably 0.01 parts by mass or less, more preferably 0.005 parts by mass or less.
When the water-hard composition of the present invention contains the component (D), the component (D) is added to 100 parts by mass of the powder (total amount of the water-hard powder and the non-water-hard powder is 100 parts by mass). From the viewpoint of liquefaction with the dispersant, preferably 0.002 parts by mass or more, more preferably 0.005 parts by mass or more, further preferably 0.007 parts by mass or more, and preferably 0.1 parts by mass or less. , More preferably 0.05 parts by mass or less, still more preferably 0.03 parts by mass or less.

The hydraulic composition of the present invention preferably contains an aggregate. Examples of the aggregate include aggregates selected from fine aggregates and coarse aggregates. Examples of the fine aggregate include those specified by No. 2311 in JIS A 0203-2014. Fine aggregates include river sand, land sand, mountain sand, sea sand, lime sand, silica sand and their crushed sand, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural) and recycled. Examples include fine aggregates. Further, as the coarse aggregate, those specified by No. 2312 in JIS A 0203-2014 can be mentioned. For example, coarse aggregates include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stones, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural) and recycled. Coarse aggregate and the like can be mentioned. As the fine aggregate and the coarse aggregate, different types may be mixed and used, or a single type may be used.

The water content of the aggregate is one of the factors that have a great influence on the fresh properties of the hydraulic composition. Since the aggregate is usually stored outdoors, the water content of the aggregate varies depending on the external environment (weather, temperature, etc.). Therefore, when such an aggregate is used for the hydraulic composition, the fluidity fluctuates due to the fluctuation of the unit water amount depending on the water content of the aggregate, the material separation resistance deteriorates, and the hydraulic composition hardens. It may affect the surface aesthetics of the body.
However, the hydraulic composition of the present invention is not easily affected by fluctuations in the unit water amount even when such an aggregate is used, so that the material separation resistance and the surface appearance of the cured product of the hydraulic composition are good. Can be.

When the hydraulic composition is concrete, the amount of coarse aggregate used reduces the development of the strength of the hydraulic composition and the amount of hydraulic powder such as cement used, and improves the filling property into the formwork and the like. From the viewpoint, the bulk volume is preferably 50% or more, more preferably 55% or more, further preferably 60% or more, and preferably 100% or less, more preferably 90% or less, still more preferably 80% or less. .. The bulk volume is the ratio of the volume (including voids) of the coarse aggregate in ^{1 m 3 of concrete.}
When the hydraulic composition is concrete, the amount of fine aggregate used is preferably 500 kg / m ³ or more, more preferably 600 kg / m ³ or more, and further, from the viewpoint of improving the filling property into a mold or the like. It is preferably 700 kg / m ³ or more, preferably 1000 kg / m ³ or less, and more preferably 900 kg / m ³ or less.
When the water-hard composition is mortar, the amount of fine aggregate used is preferably 800 kg / m ³ or more, more preferably 900 kg / m ³ or more, still more preferably 1000 kg / m ³ or more, and preferably 2000 kg / m. ^{It is 3} or less, more preferably 1800 kg / m ³ or less, still more preferably 1700 kg / m ³ or less.

Examples of the hydraulic composition include concrete and the like. Of these, concrete using cement is preferable. The hydraulic composition of the present invention can be used for self-leveling, refractory, plaster, lightweight or heavy concrete, AE, repair, prepacked, traymy, ground improvement, grout, cold weather, etc. It is also useful in the field of.

The hydraulic composition of the present invention may further contain other components (however, components (A) to (D) are excluded). For example, an AE agent, a retarding agent, a foaming agent, a thickener, a foaming agent, a fluidizing agent and the like can be mentioned.

[Method for producing a cured product of hydraulic composition]
In the method for producing a cured product of the hydraulic composition of the present invention, the hydraulic composition is prepared by mixing the component (A), the component (B), the component (C), the hydraulic powder, and water. Step to prepare,
The step of filling the mold with the prepared hydraulic composition and curing it, and
Step of demolding the cured hydraulic composition,
Have.

Specific examples and preferred embodiments of the component (A), the component (B), the component (C), and the optional component (D) used in the method for producing a cured product of the hydraulic composition of the present invention are described in the present invention. It is the same as that described in the surface aesthetic improver composition for hydraulic composition.
Further, specific examples and preferred embodiments of the hydraulic powder and the non-hydraulic powder used in the method for producing a cured product of the hydraulic composition of the present invention are the same as those described in the hydraulic composition of the present invention. Is.
Further, the matters described in the surface aesthetic improver composition for a hydraulic composition of the present invention and the hydraulic composition can be appropriately applied to the method for producing a cured product of the hydraulic composition of the present invention.

In the step of preparing the hydraulic composition, the component (A), the component (B), the component (C), the hydraulic powder, and water are mixed to prepare the hydraulic composition. In the step of preparing the hydraulic composition, the component (A), the component (B), the component (C), the optional component (D), the hydraulic powder, and water are mixed. A hydraulic composition may be prepared.
In the step of preparing the hydraulic composition, a non-hydraulic powder may be further mixed. That is, in the step of preparing the hydraulic composition, the component (A), the component (B), the component (C), the hydraulic powder, the non-hydraulic powder, and water are mixed to make the hydraulic composition hydraulic. The composition may be prepared. Further, in the step of preparing the hydraulic composition, the component (A), the component (B), the component (C), the optional component (D), the hydraulic powder, and the non-hydraulic powder are used. , Water may be mixed to prepare a hydraulic composition.
In the present invention, the component (A), the component (B), the component (C), and the optional component (D) are separately mixed with a powder (hydraulic powder and arbitrary non-hydraulic powder). The hydraulic composition may be prepared, but if the component (A), the component (B), the component (C), and the optional component (D) are mixed in advance, it is not necessary to add a new tank. Mixing those liquefied ones with hydraulic powder, that is, the surface aesthetic improver composition for hydraulic composition of the present invention and powder (hydraulic powder and arbitrary non-hydraulic powder) are mixed. It is preferable to mix.
The mixing amount of each component, hydraulic powder, non-hydraulic powder, and water in the step of preparing the hydraulic composition is the respective components, hydraulic powder, and non-water described in the hydraulic composition of the present invention. It can be applied by substituting the contents of hard powder and water with the mixed amount.

In the step of preparing the hydraulic composition, from the viewpoint of smoothly mixing the hydraulic powder such as cement with the component (A), the component (B), the component (C), and the optional component (D). It is preferable that the component (A), the component (B), the component (C), the optional component (D), and water are mixed in advance and then mixed with the hydraulic powder. Further, the surface aesthetic improver composition for a hydraulic composition of the present invention containing water can be used.

Further, in the step of preparing the hydraulic composition, a method of mixing the hydraulic powder such as cement with the surface aesthetic improver composition for the hydraulic composition of the present invention is preferable. In the surface aesthetic improver composition for hydraulic composition of the present invention, the component (A), the component (B), the component (C), and the component (D) of the optional component are described above with respect to the hydraulic powder. It is preferable to add the mixture so as to have a mixed amount (content). Specifically, the surface aesthetic improver composition for a water-hard composition of the present invention is preferably 0.01 from the viewpoint of improving the surface aesthetic with respect to 100 parts by mass of the water-hard powder, with the composition of the surface aesthetic improver composition as a solid content. More than parts by mass, more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, and preferably 3.0 parts by mass or less from the viewpoint of improving surface aesthetics by ensuring high fluidity. Is 2.5 parts by mass or less, more preferably 2.0 parts by mass or less, still more preferably 1.0 part by mass or less.

Mixing in the step of preparing the hydraulic composition can be performed using a mixer such as a mortar mixer or a forced twin-screw mixer. The mixing time is preferably 1 minute or longer, more preferably 2 minutes or longer, and preferably 5 minutes or shorter, more preferably 3 minutes or shorter. In preparing the hydraulic composition, the materials and chemicals described in the hydraulic composition and their amounts can be used.

The obtained hydraulic composition is further filled with a hydraulic composition in a mold, cured and cured. Examples of formwork include formwork for buildings, formwork for concrete products, and the like. Examples of the filling method into the mold include a method of directly charging from a mixer, a method of pumping a hydraulic composition with a pump, and a method of introducing the hydraulic composition into the mold.

When curing the hydraulic composition, it may be heat-cured to promote curing to promote curing. Here, the heat curing can promote the curing by holding the hydraulic composition at a temperature of 40 ° C. or higher and 80 ° C. or lower.

As hardened bodies of water-hardening compositions using formwork, which is a concrete product, for civil engineering products, concrete piles, concrete poles, various block products for shore protection, box culvert products, segment products used for tunnel construction, etc. Examples include girder products for piers, and examples of building products include curtain wall products, building member products used for columns, beams, and floorboards.

[Method for improving surface aesthetics of hydraulic composition]
The method for improving the surface aesthetics of a hydraulic composition of the present invention comprises adding a component (A), a component (B), and a component (C) to a hydraulic composition containing a hydraulic powder and water. This is a method for improving the surface aesthetics of a hydraulic composition.
Further, the method for improving the surface aesthetics of the hydraulic composition of the present invention is to add a component (A), a component (B), a component (C), and an optional component to the hydraulic composition containing the hydraulic powder and water. It may be a method for improving the surface aesthetics of the hydraulic composition by adding the component (D) of the above.

The method for improving the surface aesthetics of a hydraulic composition of the present invention is to obtain a cured product of a hydraulic composition having an excellent surface aesthetic even when the hydraulic composition contains a non-hydraulic powder. Can be done. That is, the method for improving the surface aesthetics of a hydraulic composition of the present invention can also be applied to a hydraulic composition containing a non-hydraulic powder.

The method for improving the surface aesthetics of the hydraulic composition of the present invention is to disperse unburned carbon contained in fly ash even in the hydraulic composition containing fly ash as a non-hydraulic powder. The surface of the cured product can be whitened without causing darkening on the surface of the cured product. That is, the method for improving the surface aesthetics of the hydraulic composition of the present invention can also be applied to the hydraulic composition containing fly ash as a non-hydraulic powder.

Specific examples and preferred embodiments of the component (A), the component (B), the component (C), and the optional component (D) used in the method for improving the surface aesthetics of the hydraulic composition of the present invention are described in the present invention. It is the same as that described in the surface aesthetic improver composition for hydraulic composition.
Further, specific examples and preferred embodiments of the hydraulic powder and the non-hydraulic powder used in the method for improving the surface aesthetics of the hydraulic composition of the present invention are the same as those described in the hydraulic composition of the present invention. ..
Further, the matters described in the method for producing a surface aesthetic improver composition for a hydraulic composition, a hydraulic composition and a cured product thereof of the present invention are appropriately applied to the method for improving the surface aesthetics of a hydraulic composition of the present invention. be able to.

As the components (A) to (D) shown in Tables 1 to 3, the following components were used.
Component (A) ・ (a-1): Fatty acid diethanolamide (compound having an alkyl group having 10 to 16 carbon atoms in the fatty acid portion), Aminone PK-02S, manufactured by Kao Co., Ltd. (a-2): Fatty acid Diethanolamide (compound having an alkyl group having 14 to 16 carbon atoms in the fatty acid portion), Amizole ODE, manufactured by Kawaken Fine Chemicals Co., Ltd. (a-3): Fatty acid diethanolamide (alkyl having 12 carbon atoms in the fatty acid portion) (Compound that is the group), manufactured by Wako Pure Chemical Industries, Ltd. (a-4): Fatty acid diethanolamide (compound that is an alkenyl group (oleyl group) having 18 carbon atoms in the fatty acid portion), Wako Pure Chemical Industries, Ltd. ) Made

(B) Ingredient (b-1): Polycarboxylic acid dispersant, Mighty 21HF, manufactured by Kao Co., Ltd. (b-2): Polycarboxylic acid dispersant, Mighty 21HP, manufactured by Kao Co., Ltd. b-3): Polycarboxylic acid-based dispersant, Mighty 21LV, manufactured by Kao Co., Ltd. (b-4): Polycarboxylic acid-based dispersant, Mighty 21VS, manufactured by Kao Co., Ltd. (b-5): Single Quantum (b2) / monomer (b1) = methacrylic acid / methoxypolyethylene glycol (23) monomethacrylate = 75 mol / 25 mol, weight average molecular weight = 50,000 (average number of added moles in parentheses)
(B-6): Monomer (b2) / Monomer (b1) = Methacrylate / methoxypolyethylene glycol (120) Monomethacrylate = 80 mol / 20 mol, Weight average molecular weight = 80,000 (in parentheses) Average number of moles added)
(B-7): Polycarboxylic acid dispersant, Aqualock HW-80, manufactured by Nippon Catalyst Co., Ltd. (b-8): Polycarboxylic acid dispersant, manufactured by Kao Corporation (b-9) ): Polycarboxylic acid dispersant, Mighty 21V, manufactured by Kao Corporation

Ingredients (C): (c-1): Phenoxyethanol, manufactured by Dow Chemical Industries, Ltd. (c-2): Phenyldiglycol, manufactured by Toho Chemical Industries, Ltd. (c-3): Diethylene glycol monobutyl ether, Wako Pure Chemical Industries, Ltd. Manufactured by Co., Ltd. (c-4): Octyldimethylamine, manufactured by Kao Corporation (c-5): Decyldimethylamine, manufactured by Kao Corporation

(C') component (comparative component of (C) component)
(C'-1): 2-ethylhexyl alcohol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-2): benzyl alcohol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-3): 2- Methyl-2,4-pentandiol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-4): 2-methyl-1,3-propanediol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-5) ): 2- (2-methoxyethoxy) ethanol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-6): Dipropylene glycol, manufactured by Wako Pure Chemical Industries, Ltd. (c'-7): propylene glycol , Wako Pure Chemical Industries, Ltd. (c'-8): Diethylene glycol, Wako Pure Chemical Industries, Ltd. (c'-9): 1,3-propanediol, Wako Pure Chemical Industries, Ltd.・ (C'-10): 1,4-butanediol, manufactured by Wako Pure Chemical Industries, Ltd. ・ (c'-11): 1,5-pentanediol, manufactured by Wako Pure Chemical Industries, Ltd.

Component (D)-(d-1): Alkyl sulfate ester salt (alkyl sulfate ammonium salt having 18 carbon atoms and an average addition molar number of ethyleneoxy groups of 23 mol), manufactured by Kao Co., Ltd.

[Example 1, Comparative Example 1]
<Preparation of surface aesthetic improver composition for hydraulic composition>
A surface aesthetic improver composition for a hydraulic composition was prepared by mixing the components (A), (B), (C), (D) and water shown in Tables 1 to 3.
Specifically, after confirming that the component (B) cannot be liquefied even if a predetermined amount of the component (B) is added to the screw tube (100 ml), the component (A) is mixed, and the mixture is heated to 50 ° C. in a constant temperature bath, then ( The component (C) was mixed, and the screw tube was stirred in a constant temperature bath (50 ° C.) until the component (B) was uniformly dispersed. When the component (D) was blended, the component (A) and the component (C) were blended. By this method, surface aesthetic improver compositions for each hydraulic composition shown in Tables 1 to 3 were obtained.

<Evaluation of compounding stability>
The compounding stability of the prepared surface aesthetic improver composition for hydraulic composition was evaluated by the following method. 20 g of a surface aesthetic improver composition for a water-hard composition was placed in a screw tube (Maruem, No. 7, 35 mm × 78 mm), irradiated with ultrasonic waves, and then left to stand for 1 hour under the condition of 20 ° C., and then. The appearance was visually observed and evaluated according to the following criteria. The results are shown in Tables 1-3.
◯: It is transparent and is not separated into two layers.
X: There is turbidity or it is separated into two layers.

In Tables 1 to 3, the blending amount of each component is mass% based on the effective amount.

<Preparation of concrete>
Coarse aggregate (G), fine aggregate (S) (half amount), cement (C) in a concrete mixer (manufactured by IHI, forced twin-screw mixer, model: DAM-60) with the amounts shown in Table 4. ), Other powders (slag (BFS) and swelling agent (CSA)), fine aggregate (S) (remaining amount), and kneaded for 10 seconds. Kneading water (W) containing the surface aesthetic improver composition for physical material was added. Then, the concrete was prepared by kneading the concrete with a concrete mixer for 120 seconds. The compounding conditions for concrete are as shown in Table 4.

The components used in Table 4 are as follows.
-Water (W): Tap water (water temperature 20 ° C.) (including the amount of the surface aesthetic improver composition for hydraulic composition)
-Cement (C): Ordinary Portland cement, manufactured by Taiheiyo Cement Co., Ltd., density 3.14 g / cm ³
-Slag (BFS): Blast furnace slag, made by Pacific Material, density 2.89 g / cm ³
-Expansion material (CSA): Inorganic powder mainly composed of lime-based special clinker, N-EX (manufactured by Pacific Material), density 3.19 g / cm ³
-Fine aggregate (S): crushed sand density 2.72 g / cm ³
-Coarse aggregate (G): Gravel density 2.64 g / cm ³

In Table 4, W / C is the mass ratio of the blended amount of water and the blended amount of the water-hard powder (cement (C)), and is [the blended amount of water (W) / the blended amount of cement (C)). ] × 100 (mass%).
W / P is the mass ratio of the blended amount of water to the total blended amount of the water-hard powder (cement (C)) and the non-water-hard powder (slag (BFS) and swelling agent (CSA)). , [Amount of water (W) / (Amount of cement (C) + amount of slag (BFS) + amount of swelling agent (CSA))] × 100 (mass%).
Further, s / a is a volume percentage (volume%) of the fine aggregate ratio in the aggregate obtained by [(S) / (S + G)] × 100.

<Evaluation of concrete fluidity>
The fluidity (mm) of the concrete immediately after kneading was measured according to JIS A 1150 (2007 (concrete slump flow test method)). The results are shown in Table 5.

<Evaluation of concrete surface aesthetics>
Immediately after kneading into a metal mold (horizontal bottom length: 5 cm, vertical bottom length: 10 cm, height 50 cm) to which a mold release agent (product name: manufactured by Parat Yamamune Chemical Co., Ltd.) has been applied in advance. Each layer of concrete was packed, filled with concrete under non-vibration conditions, and cured in the air (20 ° C) in a room at 20 ° C to be cured. Twenty-four hours after the concrete preparation, the cured specimen was removed from the mold to obtain a specimen. The number of bubble marks (surface bubble marks) having a diameter of 3 mm or more on the surface of the concrete specimen was visually counted and judged according to the following evaluation criteria. The results are shown in Table 5. The smaller the number of bubble marks having a diameter of 3 mm or more, the better the surface aesthetics.
Rank A: There were no or less than 10 holes in the specimen with a diameter of 3 mm or more.
Rank B: There were 10 or more and less than 20 holes in the specimen having a diameter of 3 mm or more.
Rank C: There were 20 or more and less than 30 holes in the specimen having a diameter of 3 mm or more.
Rank D: There were 30 or more holes in the specimen having a diameter of 3 mm or more.

In Table 5, the addition amount of the surface aesthetic improver composition for the water-hard composition is the addition amount (parts by mass) with respect to 100 parts by mass of the water-hard powder (total powder (P)).

[Example 2, Comparative Example 2]
<Preparation of concrete>
Coarse aggregate (G), fine aggregate (S) (half amount) in a concrete mixer (manufactured by IHI, forced twin-screw mixer, model: DAM-60) with the amounts shown in Formulations 1 to 5 in Table 6. ), Cement (C), other powders (calcium carbonate (LP) and fly ash (FA)), fine aggregate (S) (remaining amount), and kneaded for 10 seconds. The kneading water (W) containing the components (D) in the respective blending amounts shown in Tables 7 to 10 was added. Then, the concrete was prepared by kneading the concrete with a concrete mixer for 120 seconds. The compounding conditions for concrete are as shown in Table 6.
In Example 2-9 and Comparative Example 2-9 in Table 9, 3% by mass of water was added to the blended amount of the fine aggregate (S) when preparing the concrete.

The components used in Table 6 are as follows.
-Water (W): Tap water (water temperature 20 ° C.) (including the amount of each of the components (A) to (D) added)
-Cement (C): Ordinary Portland cement, manufactured by Sumitomo Osaka Cement Co., Ltd., density 3.15 g / cm ³
-Calcium carbonate (LP): Made by Sanyu Co., Ltd., Density 2.71 g / cm ³
-Fly ash (FA): manufactured by Chubu Electric Power Co., Inc., density 2.24 g / cm ³
-Fine aggregate (S): coarse sand, from Ibigawa Density 2.63 g / cm ³
-Coarse aggregate (G): gravel (1: 1 (mass ratio) mixture of crushed stone 1505 and crushed stone 2015), density 2.62 g / cm ³

In Table 6, W / C is the mass ratio of the blended amount of water and the blended amount of the water-hard powder (cement (C)), and is [the blended amount of water (W) / the blended amount of cement (C)). ] × 100 (mass%).
W / P is the mass ratio of the blended amount of water to the total blended amount of hydraulic powder (cement (C)) and non-hydraulic powder (calcium carbonate (LP) and fly ash (FA)). Yes, it is calculated as [water (W) blending amount / (cement (C) blending amount + calcium carbonate (LP) blending amount + fly ash (FA) blending amount)] × 100 (mass%).
Further, s / a is a volume percentage (volume%) of the fine aggregate ratio in the aggregate obtained by [(S) / (S + G)] × 100.
The powder reduction amount is the reduction amount (kg) of the powder amount of each formulation based on the powder amount of the formulation 1 (the total amount of the water-hard powder and the non-water-hard powder).

<Evaluation of concrete fluidity>
The time (seconds) required for the fluidity of the concrete immediately after kneading shown in Table 7 to reach 500 mm was measured according to JIS A 1150 (2007 (concrete slump flow test method)). The results are shown in Table 7. Shown.
Further, the concrete immediately after kneading shown in Tables 7 to 10 is filled in a slump cone placed on a horizontally installed flat plate according to JIS A 1150 (2007 (concrete slump flow test method)), and the slump cone is vertically installed. After continuously pulling up in the direction, the diameter at which the concrete spreads to the maximum when it stops moving and the diameter in the orthogonal direction are measured, and the result of the fluidity (mm) is obtained. The average value of the diameter at which the spread is maximum and the diameter in the orthogonal direction was defined as the average fluidity (mm). The results are shown in Tables 7 to 10.

<Evaluation of compressive strength of concrete>
The concrete shown in Table 7 is cured and demolded under the condition of 20 ° C. based on JIS A 1132 “How to make a specimen for concrete strength test”, and then the cured product is left at room temperature (20 ° C.) and water. Seven days after the first contact between water and the hydraulic powder in the preparation of the rigid composition, the compressive strength of the cured product was measured based on JIS A 1108 “Concrete Compressive Strength Test Method”. The results are shown in Table 7.

<Evaluation of concrete surface aesthetics>
For the concrete shown in Tables 7 to 9, the surface aesthetics of each concrete specimen obtained by hardening are evaluated by the same method as <Concrete surface aesthetic evaluation> described in [Example 1, Comparative Example 1]. did. The results are shown in Tables 7-9.

<Evaluation of material separation resistance>
With respect to the concrete shown in Table 9, the state of each concrete after concrete preparation was visually confirmed and judged according to the following evaluation criteria. The results are shown in Table 9.
None: No separation of gravel and mortar (coarse sand and cement) and no breathing on the concrete surface.
Yes: On the surface of the concrete, separation of gravel and mortar (coarse sand and cement) is seen or breathing occurs.

<Evaluation of surface whitening of concrete>
With respect to the concrete shown in Table 10, each concrete after concrete preparation was put into a disposable cup (volume 2 L), placed on a tapping table, and tapped 30 times. A photograph of the upper surface of each concrete after tapping work is taken, and a photograph of the upper surface of the specimen after curing (one day after the contact between water and the hydraulic powder) is taken, and the surface whitening is performed by the number of black dots. The evaluation of sex was judged according to the following criteria. The results are shown in Table 10. Further, FIG. 1 shows photographs of the upper surface of each concrete after the tapping work of Example 2-10 and Comparative Example 2-11. The left side of the photograph of FIG. 1 is the concrete of Comparative Example 2-11, and the right side is the concrete of Example 2-10. As shown in the photograph of FIG. 1, the concrete of Example 2-10 had a clearly smaller number of black spots on the upper surface of the concrete than that of Comparative Example 2-11.

In Table 7, each addition amount of the components (A) to (D) is an addition amount with respect to 100 parts by mass of the powder (total amount of 100 parts by mass of the hydraulic powder and the non-hydraulic powder).

Comparing Example 2-1 of Formulation 1 with Comparative Examples 2-1 and 2-2, the components (A) to (C) were compared with Comparative Examples 2-1 and 2-2 containing only the component (B). It can be seen that Example 2-1 of the present invention containing the component) has excellent surface aesthetics and fluidity, and also has good compressive strength after 7 days.
Further, as can be seen by comparing Comparative Examples 2-1 and 2-2 with Comparative Examples 2-3 and 2-4, in the case of the formulations 3 and 4 with reduced powder, the fluidity is improved, but the hydration of the cement is improved. Since the reaction is suppressed, the compressive strength after 7 days is lowered, and the surface appearance is also inferior.
However, as can be seen by comparing Example 2-2 and Comparative Example 2-3, and Example 2-3 and Comparative Example 2-4, respectively, even in the case of Formulations 3 and 4 in which the amount of powder is reduced, the component (B) is used. Compared with Comparative Examples 2-3 and 2-4 containing only components, Examples 2-2 and 2-3 of the present invention containing components (A) to (C) have surface aesthetics, fluidity, and surface aesthetics. Excellent compression strength after 7 days.

In Table 8, each addition amount of the components (A) to (D) is an addition amount with respect to 100 parts by mass of the powder (total amount of 100 parts by mass of the hydraulic powder and the non-hydraulic powder).

Comparing Examples 2-4 to 2-5 with Comparative Example 2-5, Example 2-6 with Comparative Example 2-6, and Example 2-7 with Comparative Example 2-7, a powder-reduced formulation was used. In the case of 2 to 4, compared to Comparative Examples 2-5 to 2-7 containing only the component (B), Examples 2-4-2 to the present invention containing the components (A) to (C). It can be seen that No. 7 is excellent in fluidity and surface aesthetics.

In Table 9, each addition amount of the components (A) to (D) is an addition amount with respect to 100 parts by mass of the powder (total amount of 100 parts by mass of the hydraulic powder and the non-hydraulic powder).

Comparing Example 2-8 with Comparative Examples 2-8 and 2-10, in the case of Formulation 2 in which the amount of powder was reduced, compared with Comparative Examples 2-8 and 2-10 containing only the component (B), It can be seen that Examples 2-8 of the present invention containing the components (A) to (C) are excellent in surface aesthetics and fluidity, and are good without material separation.
Further, when Example 2-9 and Comparative Example 2-9 are compared, Comparative Example 2-9 containing only the component (B) under the condition of adding water (3% by mass) to Formulation 2, that is, when the unit water amount fluctuates. However, the surface aesthetics and material separation are also caused, but Example 2-9 of the present invention containing the components (A) to (C) is excellent in surface aesthetics and fluidity, and there is no material separation. It turns out to be good.

In Table 10, each addition amount of the components (A) to (D) is an addition amount with respect to 100 parts by mass of the powder (total amount of 100 parts by mass of the hydraulic powder and the non-hydraulic powder).

In the case of Formulation 5, since fly ash is contained, the unburned carbon contained in the fly ash causes darkening on the concrete surface. As can be seen with reference to FIG. 1, Comparative Example 2-11 containing only the component (B) has poor surface whitening results, and the surface aesthetics cannot be reselected. On the other hand, it can be seen that Examples 2-10 of the present invention containing the components (A) to (C) are excellent in surface whitening property and also excellent in fluidity.

[Example 3, Comparative Example 3]
<Preparation of concrete>
Coarse aggregate (G), fine aggregate (S) (half amount) in a concrete mixer (manufactured by IHI, forced twin-screw mixer, model: DAM-60) with the amounts shown in Formulations 6 and 7 in Table 11. ), Cement (C), fly ash (FA), fine aggregate (S) (remaining amount), and kneaded for 10 seconds. The kneading water (W) contained in each blending amount of was added. Then, the concrete was prepared by kneading the concrete with a concrete mixer for 120 seconds. The compounding conditions for concrete are as shown in Table 11.

The components used in Table 11 are as follows.
-Water (W): Tap water (water temperature 20 ° C.) (including the amount of each of the components (A) to (D) added)
-Cement (C): Ordinary Portland cement, manufactured by Sumitomo Osaka Cement Co., Ltd., density 3.15 g / cm ³
-Fly ash (FA): manufactured by Chubu Electric Power Co., Inc., density 2.24 g / cm ³
-Fine aggregate (S): coarse sand, from Ibigawa Density 2.63 g / cm ³
-Coarse aggregate (G): gravel (1: 1 (mass ratio) mixture of crushed stone 1505 and crushed stone 2015), density 2.62 g / cm ³

In Table 11, W / C is the mass ratio of the blended amount of water and the blended amount of the water-hard powder (cement (C)), and is [the blended amount of water (W) / the blended amount of cement (C)). ] × 100 (mass%).
W / P is the mass ratio of the blended amount of water and the total blended amount of hydraulic powder (cement (C)) and non-hydraulic powder (fly ash (FA)). ) / (Cement (C) compounding amount + fly ash (FA) compounding amount)] × 100 (mass%).
Further, s / a is a volume percentage (volume%) of the fine aggregate ratio in the aggregate obtained by [(S) / (S + G)] × 100.
The powder reduction amount is the reduction amount (kg) of the powder amount of each preparation based on the powder amount of the preparation 6 (the total amount of the water-hard powder and the non-water-hard powder).

<Evaluation of concrete fluidity>
The fluidity (mm) and average fluidity (mm) of each concrete immediately after kneading shown in Table 12 are measured by the same method as <Evaluation of concrete fluidity> described in [Example 2, Comparative Example 2]. did. The results are shown in Table 12.

<Evaluation of surface whitening of concrete>
For the concrete shown in Table 12, photographs of the upper surface after tapping work and hardening of each concrete were taken in the same manner as in <Evaluation of surface whitening of concrete> described in [Example 2, Comparative Example 2]. Then, the evaluation of surface whitening was judged based on the number of black spots according to the following criteria. The results are shown in Table 12.
〇: The number of black spots on the upper surface of the concrete is about the same as that of the concrete of Example 2-10 (concrete on the right side of FIG. 1) both after the tapping work and after hardening.
X: The number of black spots on the upper surface of the concrete is about the same as that of the concrete of Comparative Example 2-11 (concrete on the left side of FIG. 1) both after the tapping work and after hardening, and the number of black spots is the same as that of the concrete of Example 2-10. Obviously more than that.

In Table 12, each addition amount of the components (A) to (D) is an addition amount with respect to 100 parts by mass of the powder (total amount of 100 parts by mass of the hydraulic powder and the non-hydraulic powder).
In the evaluation of fluidity, what is described as "material separation" in parentheses is concrete in which gravel and mortar (coarse sand and cement) are separated after the evaluation of the fluidity of concrete.

In the case of Formulations 6 and 7, since fly ash is contained, the unburned carbon contained in the fly ash causes darkening on the concrete surface.
Comparing Examples 3-1 and 3-2 with Comparative Examples 3-1, 3-2, 3-4, and 3-5, in the case of Formulation 6, Comparative Example 3-1 containing only the component (B), Compared with 3-2, 3-4, and 3-5, Examples 3-1 and 3-2 of the present invention containing the components (A) to (C) are excellent in fluidity and surface whitening property. You can see that.
Further, comparing Examples 3-3, 3-4 and Comparative Examples 3-3, 3-6, 3-7, in the case of Formulation 7 in which the amount of powder was reduced, Comparative Example 3-containing only the component (B). Compared with 3, 3-6, 3-7, Examples 3-3, 3-4 of the present invention containing the components (A) to (C) are excellent in fluidity and surface whitening property. You can see that.

Claims (9)

(A) Fatty acid alkanolamide having 10 or more and 24 or less carbon atoms in the fatty acid moiety, (B) a polycarboxylic acid-based dispersant, and (C) represented by the following general formulas (c1) and the following general formula (c2). one or more solvents selected from that compound,
The content of (A) is 1.0% by mass or more and 10% by mass or less,
The content of (B) is 15% by mass or more and 30% by mass or less,
A surface aesthetic improver composition for a hydraulic composition containing (C) so as to have a content of 2.4% by mass or more and 15% by mass or less.
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ] The surface aesthetic improver composition for a hydraulic composition according to claim 1, which is for a hydraulic composition containing a non-hydraulic powder. (A) Fatty acid alkanolamide having a fatty acid portion having 10 or more and 24 or less carbon atoms, (B) a polycarboxylic acid-based dispersant, (C) represented by the following general formula (c1) and the following general formula (c2). One or more solvents selected from compounds, water-hard powders, optionally non-water-hard powders, and water .
The content of (A) is 0.005 part by mass or more and 0.05 part by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (B) is 0.4 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (C) is 0.01 parts by mass or more and 0.1 parts by mass or less with respect to 100 parts by mass of powder (total amount of hydraulic powder and non-hydraulic powder is 100 parts by mass). The hydraulic composition contained.
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ] The hydraulic composition according to claim 3, further containing a non-hydraulic powder. The fourth aspect of claim 4, wherein the mass ratio (hydraulic powder / non-hydraulic powder) of the content of the hydraulic powder to the content of the non-hydraulic powder is 0.25 or more and 10 or less. Hydraulic composition. (A) Fatty acid alkanolamide having a fatty acid portion having 10 or more and 24 or less carbon atoms, (B) a polycarboxylic acid-based dispersant, and (C) represented by the following general formulas (c1) and the following general formula (c2). One or more solvents selected from the compounds, water-hard powders, optionally non- water-hard powders, and water .
The content of (A) is 0.005 part by mass or more and 0.05 part by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (B) is 0.4 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (C) is 0.01 parts by mass or more and 0.1 parts by mass or less with respect to 100 parts by mass of powder (total amount of hydraulic powder and non-hydraulic powder is 100 parts by mass). The process of mixing to prepare a hydraulic composition,
The step of filling the mold with the prepared hydraulic composition and curing it, and
Step of demolding the cured hydraulic composition,
A method for producing a cured product of a hydraulic composition having the above.
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ] The method for producing a cured product of a hydraulic composition according to claim 6, wherein a non-hydraulic powder is further mixed in the step of preparing the hydraulic composition. A fatty acid alkanolamide having (A) a fatty acid moiety having 10 or more and 24 or less carbon atoms and (B) a polycarboxylic acid are added to a water-hardening composition containing a water-hardening powder, water, and optionally a non-water-hardening powder. The system dispersant and (C) one or more solvents selected from the compounds represented by the following general formulas (c1) and the following general formulas (c2) are used .
The content of (A) is 0.005 part by mass or more and 0.05 part by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (B) is 0.4 parts by mass or more and 2.0 parts by mass or less with respect to 100 parts by mass of powder (total amount of water-hard powder and non-water-hard powder is 100 parts by mass).
The content of (C) is added in an amount of 0.01 part by mass or more and 0.1 part by mass or less with respect to 100 parts by mass of powder (total amount of hydraulic powder and non-hydraulic powder is 100 parts by mass). A method for improving the surface aesthetics of a hydraulic composition.
R ^1c- O-[(EO) _n · (PO) _m ] -H (c1)
[In the formula, R ^1c is a hydrocarbon group having 4 or more and 15 or less carbon atoms, EO is an ethyleneoxy group, PO is a propyleneoxy group, n is a number of 1 or more and 5 or less, and m is a number of 0 or more and 5 or less. EO and PO may be blocked or randomly combined. ]

[In the formula, R ^2c is a hydrocarbon group having 6 or more and 12 or less carbon atoms, and R ^3c and R ^4c are independently hydrocarbon groups having 1 or more and 4 or less carbon atoms. ] The method for improving the surface aesthetics of the hydraulic composition according to claim 8, wherein the hydraulic composition further contains a non-hydraulic powder.

Images